I ordered this, together with The Art of Star Wars: Rogue One, the other day. While I'm not much of a fan of the movie, I always think it's interesting to follow the creative process. And this book also contains a few examples of artwork that George Lucas approved for Episode VII when he was still considering to develop it.

I have. But I've scarcely cracked the covers because I've yet to see The Last Jedi.

Waiting now for the disc, hoping to avoid major spoilers--well, anymore: I've seen a couple of things that I assume are spoilers, but which, in isolation, a) don't make a lot of sense, or b) do much to spoil the story.